CVE-2021-42338 : Security Advisory and Response

4MOSAn GCB Doctor's login page has a critical improper authorization vulnerability that allows unauthenticated attackers to bypass authentication and manipulate the system.

Understanding CVE-2021-42338

4MOSAn GCB Doctor - Improper Authorization

What is CVE-2021-42338?

4MOSAn GCB Doctor's login page has improper validation of Cookie, enabling unauthenticated remote attackers to bypass authentication through code injection and manipulate the system by uploading and executing arbitrary files.

The Impact of CVE-2021-42338

This vulnerability has a CVSS base score of 9.8, indicating critical severity with high confidentiality, integrity, and availability impact, allowing attackers to disrupt services.

Technical Details of CVE-2021-42338

Vulnerability Description

Improper validation of Cookie on the login page
Allows unauthenticated remote attacker to bypass authentication and manipulate the system

Affected Systems and Versions

Affected Product: GCB Doctor
Vendor: 4MOSAn
Affected Version: <= 20210708(v2.0)

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
Scope: Unchanged
No user interaction required

Mitigation and Prevention

Immediate Steps to Take

Update 4MOSAn GCB Doctor to version 20210811 (v2.0)

Long-Term Security Practices

Implement proper input validation and authentication mechanisms
Regularly monitor and audit system logs for unusual activities
Conduct security training for personnel
Stay informed about security best practices
Follow secure coding guidelines and practices

Patching and Updates

Apply security patches promptly and regularly to protect against known vulnerabilities